Jerome F. Hajjar - Department of Civil and Environmental Engineering

Kasai et al. 2010

This paper discusses the results from a full scale study of the effect of various dampers and isolation systems in a steel frame building. The testing took place at the E-Defense shaking table facility in Japan. The objective was to validate the reliability of the passive control technology through realistic experiments.

System Concept

The 5-story MRF consisted of 12 dampers of the same type with three to four different sizes. The five categories of primary dampers examined were viscous, oil, viscoelastic, steel, and friction. A steel, oil, viscous, and viscoelastic damper were experimentally tested for this research project. The building was tested repeatedly with the damper type being replaced for each damper type due to economic reasons. The excitations simulated were a DBE, maximum considered earthquake acceleration, the JR Takatori Ground Motions, and a 5% Damping Ratio.

Experimental Study, Results, and Discussion

The quantities which were measured included strains, deformations and displacements, 3D-Accelerations, pressure between ceiling edge and partitions, ceiling hander reactions force, and motion records outside and inside the building. Experimental measurements were compared to previous analytical predictions.

Story shear based on inertia forces and story shear based on member forces was found to match the predicted values well. The hysteresis curves showed significant energy dissipation and the story drift angle was found to be under the 1% radian design target value. These peak responses were compared with the buildings response without dampers and were shown to be considerably l

Reference

Kasai, K., Ito, H., Ooki, Y., Hikino, T., Kajiwara, K., Motoyui, S., Ozaki, H., and Ishii, M. (2010) “Full-Scale Shake Table Tests of 5-Story Steel Building with Various Dampers,” Joint Conference Proceedings, 7th International Conference on Urban Earthquake Engineering (7CUEE) and 5th International Conference on Earthquake Engineering (5ICEE), Tokyo Institute of Technology, Tokyo, Japan, March 3-5.